A099436 Number of simple connected class-1 graphs on n nodes.

1, 1, 1, 6, 17, 109, 821, 11050, 260150

Offset

1,4

Links

Table of n, a(n) for n=1..9.

Gordon Royle, Small Graphs: Class 2 Graphs.

Eric Weisstein's World of Mathematics, Class 1 Graph

Crossrefs

Cf. A099435 (number of simple class-1 graphs on n nodes).

Cf. A099438 (number of connected class-2 graphs on n nodes).

Sequence in context: A154494 A130278 A024080 * A209482 A209341 A355787

Adjacent sequences: A099433 A099434 A099435 * A099437 A099438 A099439

Keyword

nonn,more

Author

Eric W. Weisstein, Oct 15 2004

Extensions

More terms from Vladeta Jovovic, Jun 30 2007

Verified up to a(9) by Eric W. Weisstein, Nov 21 2011

Status

approved